/*
 131108-xxj-ajaxFileUpload.js 无刷新上传图片 jquery 插件，支持 ie6-ie10
 依赖：jquery-1.6.1.min.js
 主方法：ajaxFileUpload 接受 json 对象参数
 参数说明：
 fileElementId：必选,上传文件域ID
 url：必选，发送请求的URL字符串
 fileFilter：可选，限定上传文件的格式（.jpg,.bmp,.gif,.png）
 fileSize:可选，0 为无限制(IE浏览器不兼容)
 data:可选，将和文件域一同post的参数（json对象）
 其它：$.ajax 的参数均为可选参数
 注：如遇到‘无法访问’的脚本错误提示则需要在响应流中加一段脚块一同输出：<script ...>document.domain = 'xxx.com';</script>
 */
jQuery.extend({
    //创建 iframe 元素,接受提交及响应
    createUploadIframe: function(id, uri) {
        //create frame
        var frameId = 'jUploadFrame' + id;


        if (window.ActiveXObject) {
            //fix ie9 and ie 10-------------
            if (jQuery.browser.version == "9.0" || jQuery.browser.version == "10.0") {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            } else if (jQuery.browser.version == "6.0" || jQuery.browser.version == "7.0" || jQuery.browser.version == "8.0") {
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if (typeof uri == 'boolean') {
                    io.src = 'javascript:false';
                } else if (typeof uri == 'string') {
                    io.src = uri;
                }
            }
        } else {
            var io = document.createElement('iframe');
            io.id = frameId;
            io.name = frameId;
        }
        io.style.position = 'absolute';
        io.style.top = '-1000px';
        io.style.left = '-1000px';


        document.body.appendChild(io);


        return io;
    },
    //创建 from 元素，用于提交的表单
    createUploadForm: function(id, fileElementId, data) {
        //create form<span style="white-space:pre">   </span>
        var formId = 'jUploadForm' + id;
        var fileId = 'jUploadFile' + id;
        var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
        var oldElement = $('#' + fileElementId);
        var newElement = $(oldElement).clone();


        $(oldElement).attr('id', fileId);
        $(oldElement).before(newElement);
        $(oldElement).appendTo(form);
        //添加自定义参数
        if (data) {
            //递归遍历JSON所有键值


            function recurJson(json) {
                for (var i in json) {
                    $("<input name='" + i + "' id='" + i + "' value='" + json[i] + "' />").appendTo(form);
                    if (typeof json[i] == "object") {
                        recurJson(json[i]);
                    }
                }
            }


            recurJson(data);
        }
        //set attributes
        $(form).css('position', 'absolute');
        $(form).css('top', '-1200px');
        $(form).css('left', '-1200px');
        $(form).appendTo('body');
        return form;
    },
    //上传文件
    //s 参数：json对象
    ajaxFileUpload: function(s) {
        s = jQuery.extend({fileFilter:"",fileSize:0}, jQuery.ajaxSettings, s);
        //文件筛选
        var fielName = $('#' + s.fileElementId).val();
        var extention = fielName.substring(fielName.lastIndexOf(".") + 1).toLowerCase();
        if (s.fileFilter && s.fileFilter.indexOf(extention) < 0) {
            alert("仅支持 (" + s.fileFilter + ") 为后缀名的文件!");
            return;
        }
        //文件大小限制
        if (s.fileSize > 0) {
            var fs = 0;
            try {
                if (window.ActiveXObject) {
                    //IE浏览器
                    var image = new Image();
                    image.dynsrc = fielName;
                    fs = image.fileSize;
                } else {
                    fs = $('#' + s.fileElementId)[0].files[0].size;
                }
            } catch(e) {
            }
            if (fs > s.fileSize) {
                alert("当前文件大小 (" + fs + ") 超过允许的限制值 (" + s.fileSize +")！");
                return;
            }
        }
        var id = new Date().getTime();
        //创建 form 表单元素
        var form = jQuery.createUploadForm(id, s.fileElementId, s.data);
        //创建 iframe 贞元素
        var io = jQuery.createUploadIframe(id, s.secureuri);
        var frameId = 'jUploadFrame' + id;
        var formId = 'jUploadForm' + id;
        //监测是否有新的请求
        if (s.global && !jQuery.active++) {
            jQuery.event.trigger("ajaxStart"); //触发 AJAX 请求开始时执行函数。Ajax 事件。
        }
        var requestDone = false;
        //创建请求对象
        var xml = {};
        if (s.global)
            jQuery.event.trigger("ajaxSend", [xml, s]); //触发 AJAX 请求发送前事件
        //上载完成的回调函数
        var uploadCallback = function(isTimeout) {
            var io = document.getElementById(frameId);
            try {
                //存在跨域脚本访问问题，如遇到‘无法访问’提示则需要在响应流中加一段脚块：<script ...>document.domain = 'xxx.com';</script>
                if (io.contentWindow) { //兼容各个浏览器，可取得子窗口的 window 对象
                    xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
                    xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;


                } else if (io.contentDocument) { //contentDocument Firefox 支持，> ie8 的ie支持。可取得子窗口的 document 对象。
                    xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
                    xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
                }
            } catch(e) {
                jQuery.handleErrorExt(s, xml, null, e);
            }
            if (xml || isTimeout == "timeout") {
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    // Make sure that the request was successful or notmodified
                    if (status != "error") {
                        //处理数据（运行XML通过httpData不管回调）
                        var data = jQuery.uploadHttpData(xml, s.dataType);
                        // If a local callback was specified, fire it and pass it the data
                        if (s.success)
                            s.success(data, status);


                        // Fire the global callback
                        if (s.global)
                            jQuery.event.trigger("ajaxSuccess", [xml, s]);
                    } else
                        jQuery.handleErrorExt(s, xml, status);
                } catch(e) {
                    status = "error";
                    jQuery.handleErrorExt(s, xml, status, e);
                }


                // The request was completed
                if (s.global)
                    jQuery.event.trigger("ajaxComplete", [xml, s]);


                // Handle the global AJAX counter
                if (s.global && !--jQuery.active)
                    jQuery.event.trigger("ajaxStop");


                // Process result
                if (s.complete)
                    s.complete(xml, status);


                jQuery(io).unbind();


                setTimeout(function() {
                    try {
                        $(io).remove();
                        $(form).remove();
                    } catch(e) {
                        jQuery.handleErrorExt(s, xml, null, e);
                    }


                }, 100);


                xml = null;


            }
        };
        //超时检查，s.timeout 毫秒后调用 uploadCallback 回调函数提示请求超时
        if (s.timeout > 0) {
            setTimeout(function() {
                // Check to see if the request is still happening
                if (!requestDone) uploadCallback("timeout");
            }, s.timeout);
        }
        try {
            //设置动态 form 表单的提交参数
            // var io = $('#' + frameId);
            var form = $('#' + formId);
            $(form).attr('action', s.url);
            $(form).attr('method', 'POST');
            $(form).attr('target', frameId);
            if (form.encoding) {
                form.encoding = 'multipart/form-data';
            } else {
                form.enctype = 'multipart/form-data';
            }
            $(form).submit();


        } catch(e) {
            jQuery.handleErrorExt(s, xml, null, e);
        }
        //向动态表单的页面加载事件中注册回调函数
        if (window.attachEvent) {
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        } else {
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        }
        return {
            abort: function() {
            }
        };


    },
    //上传文件
    uploadHttpData: function(r, type) {
        //alert("type=" + type + ";uploadHttpData" + JSON.stringify(r))
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // If the type is "script", eval it in global context
        if (type == "script")
            jQuery.globalEval(data);
        // Get the JavaScript object, if JSON is used.
        if ( type == "json" ){
            data = jQuery.parseJSON(jQuery(data).text());
        }
        // evaluate scripts within html
        if (type == "html")
            jQuery("<div>").html(data).evalScripts();
        //alert($('param', data).each(function(){alert($(this).attr('value'));}));
        return data;
    },
    handleErrorExt: function(s, xhr, status, e) {
        // If a local callback was specified, fire it
        if (s.error) {
            s.error.call(s.context || s, xhr, status, e);
        }


        // Fire the global callback
        if (s.global) {
            (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
        }
    }
}); /**
 * Created by Jiarui on 2016/7/28.
 */
